I believe bitcoin is better that Western Union in transferring small amounts abroad and with very low fees. But with big amounts, one should choose a time that has stable prices because if the btc value declined rapidly and suddenly during the transaction and exchanging it , it will be a significant loss!!
Yeah, but still bitcoin is better then WU irrespective of the value, and once you post a trade on website, you will get the same value at the time of transaction, so no need to worry, just transfer when the value is high, that would be more profitable.